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Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in allowance for doubtful accounts            
Balance at beginning of year $ 1,041 $ 764 $ 944      
Provision charged to expense 841 989 619      
Accounts written off, net of recoveries 931 712 799      
Balance at end of year 951 1,041 764      
Components of allowance for doubtful accounts            
Allowance for doubtful accounts related to accounts receivable-customer       $ 892 $ 806 $ 702
Allowance for doubtful accounts related to other accounts receivable       59 235 62
Total allowance for doubtful accounts 1,041 764 944 951 1,041 764
GSWC            
Changes in allowance for doubtful accounts            
Balance at beginning of year 865 761 919      
Provision charged to expense 850 816 627      
Accounts written off, net of recoveries 764 712 785      
Balance at end of year 951 865 761      
Components of allowance for doubtful accounts            
Allowance for doubtful accounts related to accounts receivable-customer       892 806 702
Allowance for doubtful accounts related to other accounts receivable       59 59 59
Total allowance for doubtful accounts $ 865 $ 761 $ 919 $ 951 $ 865 $ 761